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I don't think it will ever be perfect, It definitely is going to have some weakness, my first battle I didn't have any physical bulk and I got owned by a fighting type. 4 of my pokemon had a weakness.
yeah I got beat by a nasty drizzle team earlier, but im fairly new you're only the fourth person i've battled. I ditched Tyrannitar for a conkeldurr to try to bulk up my physical walls
i was just testing movesets on blissey, i had thunderwave but replaced with toxic just before our match lol, i didn't feel like making a new blissey but im going to replace flamethrower with seismic
hax lol. you were probably gonna win my swampert is weak to grass but has ice beam idk how fast your shaymin is but im willing to bet it coulda tanked an ice beam